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Many of these printers that support different font sizes actually use HTML, but with a VERY limited tag set. So the person setting up the printer propably tough "if it support <font> it must support <br>". Might even be a HTTP printer, press the button and it does a request to 'server', and then prints the response from the server on a piece of paper.
Pretty cool and makes development of advanced systems pretty easy, but you must read the documentation of exactly whats supported.
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